OT GPSes and altitude

[Steve B]

Garmin 12xl. Available cheap on ebay. Bulletproof. Accurate to your described tolerances.

Steve

[Steve B]

Define "is".

[George]

I haven't noticed a difference. If anything the lowest performing GPS I have (smartphone with GPS chipset) has been performing better.

[George]

It could be if the earth wasn't in the way. X & Y are more accurate than Z (vertical) because of where the satellites are relative to a user. For Z to be as accurate your GPS would need to see satellites that are well below the horizon.

[JIMMIE]

I ve taken mine out to several precision surveyed locations and the Lat long is very close, maybe 1 M, but altitude is all over the place.

Jimmie

[hallerb]

since the gPSA knows WHERE YOU ARE, within a few feet it should have your altitude

[Rudy]

Yes, my very OLD Magellan 315 GPS does

[gpsman]

I had (RIP) a ski buddy who was nuts about how many vertical feet he could get in x time. He had some kind of barometer/recorder. I measure my skiing in fun/yard sales/injuries.

This is a (used) prototype of the first GPS watch (needs a battery and a dusting).

It'll get you within 100 yards, horizontally, under any conditions where you have sufficient landmarks to triangulate a position, like, on top of a mountain.

On top of a mountain, at night, it's still nearly as good as anything now available. -----

- gpsman

[Rudy]

GPSman..Hmmmm.. Do you know where I can get a copy of the Magellan DATAsend CD Rom for a Magellan 315 handheld GPS ? Its the DATASEND I'm looking for, not the MAPsend

R